Malicious PDF — malware analysis report

Static analysis result for SHA-256 9034a031b6d32499…

MALICIOUS

PDF

92.8 KB Created: 2021-07-04 16:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 385c6c543f9ad3535c3578abededb17c SHA-1: 038b0cf4357e62ff2e60157f02db3cebc93b94cd SHA-256: 9034a031b6d32499c8de8507dd065dda0c9f171381f10a9ff90a73067a7dba86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f9d66458---vosonanugifu.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/43bd26620fb37440e670e7a88d65b15a/varaviwopekosad.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/nizunofuvik.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160905d93dd3f7---97884205452.pdf
    • http://geose.ru/userfiles/file/938080761.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a2213dc8---zutaz.pdf
    • http://red-persimmons.com/upfiles/editor/files/26448718202.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16071d67d90628---wozivonosarazek.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107a91a11c---xetaruvetef.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4578870eaf30e6c18d20da14a23f2f72/weludezes.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9c1cbeb0c0f1ed42da875de8538caea8/namovagosexinitek.pdf
    • http://agendatourvietnam.com/hinhanh/file/18265681650.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/3f9f56265fe43e2223182dceff8689b5/legisigitiniwolojaxe.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f2c79c13983447d6b2dc57accce2afcb/44387787858.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286fb9238d---befinulufokidowobene.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1n2rofrk0av70r4revvq7kgr93/mexek.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b92a8d26101c1c60cf6e4a79306446f0/72919179359.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5df95c139275cb432d4904be4b13693/zorosolavovaridif.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/tidadoroxisodoxu.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/52d5e01e56906412ccb5b98c48e90243/1590523298.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a838064b3c8---bawuf.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f0cd5285eb2b3e464b6d07e5a78a20d7/63307521184.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c0341a399ec5a0f96651647ed69ea93d/woxererizuxafagaxajaze.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/gq20h5l44sh54tm2pfkltlg0h7/18874345998.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c81f2614---28869774698.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=4+pics+1+word+level+450+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001081a.bin
0b820892815c2e3db5a8c914b705c7426004d7a81272b48ca8c2d95710664259
pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 17084 bytes
font_01_sfnt_off00013445.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 16792 bytes
font_02_sfnt_off00014c5c.bin
43ee1148dbbec0b8f662402716c0b93e3a81c035df6c52020e142cb243a39942
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5C 10848 bytes